2151798919 has 18 divisors (see below), whose sum is σ = 2322319920. Its totient is φ = 1993073472.

The previous prime is 2151798911. The next prime is 2151798967. The reversal of 2151798919 is 9198971512.

It is not a de Polignac number, because 2151798919 - 2³ = 2151798911 is a prime.

It is a super-2 number, since 2×2151798919² = 9260477175619137122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151798911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7008964 + ... + 7009270.

Almost surely, 2^2151798919 is an apocalyptic number.

2151798919 is a deficient number, since it is larger than the sum of its proper divisors (170521001).

2151798919 is an frugal number, since it uses more digits than its factorization.

2151798919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 403 counting only the distinct ones).

The product of its digits is 408240, while the sum is 52.

The square root of 2151798919 is about 46387.4866639701. The cubic root of 2151798919 is about 1291.0227490035.

The spelling of 2151798919 in words is "two billion, one hundred fifty-one million, seven hundred ninety-eight thousand, nine hundred nineteen".